At last! In a welcome dose of good news, the Environmental Protection Agency has declared that greenhouse gases are a threat to human health and therefore fair game to be regulated. How does this relate to food? Industrialized agriculture produces almost 20% of greenhouse gases, according to a prominent UN report. While environmental regulators work to overcome hysterical resistance from agribusiness and other polluting industries, you can help by buying food that is fresh, local, organic, and in season